3,12-dihydroxy-N-{2-hydroxy-3-[2-hydroxy-23-(1-hydroxyethyl)-6,26-dimethyl-4,7,19,22,25,28,31-heptaoxo-1,2,3,3a,4,5,6,7,8,9,10,15,18,19-tetradecahydro-17H-18,9-(epiminoethanoiminoethanoiminoethanoiminomethano)pyrrolo[1',2':5,6][1,5,8,11]thiatriazacyclopen